1 /* 2 * QEMU Timer based audio emulation 3 * 4 * Copyright (c) 2004-2005 Vassili Karpov (malc) 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include "qemu-common.h" 25 #include "audio.h" 26 #include "qemu-timer.h" 27 28 #define AUDIO_CAP "noaudio" 29 #include "audio_int.h" 30 31 typedef struct NoVoiceOut { 32 HWVoiceOut hw; 33 int64_t old_ticks; 34 } NoVoiceOut; 35 36 typedef struct NoVoiceIn { 37 HWVoiceIn hw; 38 int64_t old_ticks; 39 } NoVoiceIn; 40 41 static int no_run_out (HWVoiceOut *hw) 42 { 43 NoVoiceOut *no = (NoVoiceOut *) hw; 44 int live, decr, samples; 45 int64_t now; 46 int64_t ticks; 47 int64_t bytes; 48 49 live = audio_pcm_hw_get_live_out (&no->hw); 50 if (!live) { 51 return 0; 52 } 53 54 now = qemu_get_clock (vm_clock); 55 ticks = now - no->old_ticks; 56 bytes = muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ()); 57 bytes = audio_MIN (bytes, INT_MAX); 58 samples = bytes >> hw->info.shift; 59 60 no->old_ticks = now; 61 decr = audio_MIN (live, samples); 62 hw->rpos = (hw->rpos + decr) % hw->samples; 63 return decr; 64 } 65 66 static int no_write (SWVoiceOut *sw, void *buf, int len) 67 { 68 return audio_pcm_sw_write (sw, buf, len); 69 } 70 71 static int no_init_out (HWVoiceOut *hw, struct audsettings *as) 72 { 73 audio_pcm_init_info (&hw->info, as); 74 hw->samples = 1024; 75 return 0; 76 } 77 78 static void no_fini_out (HWVoiceOut *hw) 79 { 80 (void) hw; 81 } 82 83 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...) 84 { 85 (void) hw; 86 (void) cmd; 87 return 0; 88 } 89 90 static int no_init_in (HWVoiceIn *hw, struct audsettings *as) 91 { 92 audio_pcm_init_info (&hw->info, as); 93 hw->samples = 1024; 94 return 0; 95 } 96 97 static void no_fini_in (HWVoiceIn *hw) 98 { 99 (void) hw; 100 } 101 102 static int no_run_in (HWVoiceIn *hw) 103 { 104 NoVoiceIn *no = (NoVoiceIn *) hw; 105 int live = audio_pcm_hw_get_live_in (hw); 106 int dead = hw->samples - live; 107 int samples = 0; 108 109 if (dead) { 110 int64_t now = qemu_get_clock (vm_clock); 111 int64_t ticks = now - no->old_ticks; 112 int64_t bytes = 113 muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ()); 114 115 no->old_ticks = now; 116 bytes = audio_MIN (bytes, INT_MAX); 117 samples = bytes >> hw->info.shift; 118 samples = audio_MIN (samples, dead); 119 } 120 return samples; 121 } 122 123 static int no_read (SWVoiceIn *sw, void *buf, int size) 124 { 125 int samples = size >> sw->info.shift; 126 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired; 127 int to_clear = audio_MIN (samples, total); 128 audio_pcm_info_clear_buf (&sw->info, buf, to_clear); 129 return to_clear; 130 } 131 132 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...) 133 { 134 (void) hw; 135 (void) cmd; 136 return 0; 137 } 138 139 static void *no_audio_init (void) 140 { 141 return &no_audio_init; 142 } 143 144 static void no_audio_fini (void *opaque) 145 { 146 (void) opaque; 147 } 148 149 static struct audio_pcm_ops no_pcm_ops = { 150 no_init_out, 151 no_fini_out, 152 no_run_out, 153 no_write, 154 no_ctl_out, 155 156 no_init_in, 157 no_fini_in, 158 no_run_in, 159 no_read, 160 no_ctl_in 161 }; 162 163 struct audio_driver no_audio_driver = { 164 INIT_FIELD (name = ) "none", 165 INIT_FIELD (descr = ) "disabled audio", 166 INIT_FIELD (options = ) NULL, 167 INIT_FIELD (init = ) no_audio_init, 168 INIT_FIELD (fini = ) no_audio_fini, 169 INIT_FIELD (pcm_ops = ) &no_pcm_ops, 170 INIT_FIELD (can_be_default = ) 1, 171 INIT_FIELD (max_voices_out = ) INT_MAX, 172 INIT_FIELD (max_voices_in = ) INT_MAX, 173 INIT_FIELD (voice_size_out = ) sizeof (NoVoiceOut), 174 INIT_FIELD (voice_size_in = ) sizeof (NoVoiceIn) 175 }; 176